What to Do With Used Coffee Grounds After Brewing

If you brew coffee at home, chances are you toss the used grounds straight into the trash. But what if those leftover grounds could still do something useful? Many coffee drinkers assume brewed coffee remnants are useless, but with a few simple steps, they can serve multiple practical purposes around the house.

Yes, used coffee grounds — once dried — can deodorize your fridge, absorb moisture in damp spaces, and even function as a DIY body scrub. All it takes is air-drying the grounds after brewing and storing them properly. Here’s a breakdown of how to repurpose them effectively.

1. Natural Deodorizer for Fridge and Shoes

One of the easiest and most effective uses for used coffee grounds is as a natural deodorizer. After brewing, let the grounds dry completely — spread them on a tray and place them in sunlight or leave them out overnight. Once fully dry, transfer them into a small soft cloth bag, an old sock, or even a used paper cup.

Place the container in your fridge to neutralize odors, much like baking soda. For shoes, use a smaller pouch and tuck it into the toe area overnight. By morning, it helps dry out moisture and reduce odor — especially handy during humid months.

2. Absorbing Moisture in Damp Spaces

Used coffee grounds also work surprisingly well as a DIY desiccant. In high-humidity environments — such as Shanghai’s rainy season — they can help absorb excess moisture. Users report filling large bags with a month’s worth of dried grounds and placing them in closets or entryways.

While most households may not go through 150g of coffee daily (the amount cited in the original test), even smaller batches of dried grounds can help cut down dampness. They’re not as refined as commercial silica packs, but they’re free and biodegradable.

3. Body Scrub and Potential Weight Loss Aid

Some coffee enthusiasts use grounds as a skin exfoliant. By wrapping a handful in a thin cloth or gauze, you can gently scrub your body during a shower, before applying soap. The abrasiveness creates friction and warmth, which some users associate with improved circulation or a slight tightening effect.

More experimental users apply a thicker layer of grounds to areas like thighs or abdomen, then wrap with plastic wrap and take a hot shower for 30 minutes before washing off. While this method hasn’t been scientifically validated, advocates claim better results for targeted slimming. (Note: those with sensitive skin may want to avoid direct application or prolonged exposure.)

4. Other Experimental Uses (Not Tried Here)

The original author also mentioned hearing about coffee grounds being used as plant fertilizer. However, concerned about accidentally harming houseplants, they chose not to test this themselves. While some gardeners do use grounds to improve soil texture or deter pests, improper use can affect pH or invite mold — so caution is advised.

Frequently Asked Questions

Can I really use any used coffee grounds as a deodorizer?

Yes, but they must be fully dry first. Wet or freshly brewed grounds will mold and smell worse. Spread them out to air-dry completely, ideally in sunlight, before using them in the fridge, shoes, or closet.

How long do dried coffee grounds last as a deodorizer?

There’s no fixed expiry, but they gradually lose effectiveness as they absorb odors and moisture. Most users replace them every 1–2 weeks for best results, depending on how strong the odors are or how damp the environment is.

Is it safe to use coffee grounds on my skin?

For most people, yes — but gently. Wrap the grounds in fabric and use them as a mild scrub before soap. Avoid direct application to sensitive skin, and don’t use it as a wrap with plastic for extended periods unless you know your skin can tolerate it.

Do coffee grounds actually reduce fridge smells?

Yes. Much like baking soda, dry coffee grounds absorb odors. Place them in a breathable bag or sock and put them in your fridge. They’ll help neutralize smells from leftovers or spoiled food.

How much coffee do I need to make this work?

Even small amounts help. For shoes or a drawer, a handful of dried grounds is enough. For larger spaces like fridges or closets, a cup or more of dried grounds works better. The original tester used 150g per day, but most households won’t need that quantity.

Can I compost used coffee grounds?

Though not asked in the original article, yes — used coffee grounds are compostable. They add nitrogen to compost piles and can help balance carbon-rich materials like leaves or paper.

Recommended FrontStreet Beans for Home Brewing

Try FrontStreet Coffee’s Ethiopia Yirgacheffe for a bright, citrusy profile that highlights clean extractions — perfect for appreciating freshly brewed coffee and, by extension, making the most of your grounds afterward. Their Guatemala Antigua offers chocolatey and spicy notes, great for classic pour-over methods that generate reusable grounds. Both beans are roasted to highlight origin character, making your everyday brew ritual more worthwhile. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.